Lennox 51M91 Gasket 321042-401 This signifies that the switch

This signifies that the switch will open (break the circuit) at 145°F to stop the burners and close (completed circuit) once the temperature drops to 105°F

Key Benefits Precise Calibration: Factory-set at

safety switch monitoring

Can this 3-way valve be used for diverting

Common Questions & Technical Support Does this board support two-stage heating cycles

Lennox 51M91 Gasket 321042-401 This signifies that the switchThe Lennox 51M91 Blower Gasket is a critical high temperature seal designed specifically for Lennox furnace blower assemblies and 4 inch inducer motor housings. Engineered to withstand the thermal cycling inherent in high efficiency HVAC systems, this 4 inch blower gasket ensures an airtight seal between the blower housing and the furnace cabinet, preventing bypass air and maintaining static pressure integrity. This OEM replacement component is vital